Appendix Q: State By State

Appendix Q: State By State

Photo: American Tiny House

This is a work in progress as more jurisdictions and states are added as they adopt Appendix Q

List Of Municipality Or State That Has Adopted Appendix Q

Please due your own due diligence. If you see a state or county listed, check with your municipality to clarify that they have the same jurisdiction

Alaska: In Alaska the IRC is not adopted statewide. The “Deferred Cities” can adopt additional codes and some jurisdictions adopt the IRC and the IECC.

The IBC, IFC, IMC in Alaska are adopted by administrative rule making by the Alaska State Fire Marshal. The adopted code by state agencies are mandatory and fall under state inspection programs unless a local jurisdiction has been delegated by the code program as a “deferred jurisdiction.” When this occurs, the local jurisdiction administers and enforces their local program of the adopted state codes.

State Fire Marshall Of Alaska Richard Boothby

Deferred Jurisdictions

Tiny Houses In Juneau

Juneau, Alaska has NOT adopted Appendix Q at this time, however, they are usually it as a Guide for residents to build tiny homes on a foundation. I spoke with a few officials and it will take years for any new code changes. August 1st, 2019.


Note: Arizona is one of the friendliest states in the country regarding tiny homes, including tiny homes on wheels. I will be including information for tiny homes on wheels and park models, even if Appendix Q has not been adopted as helpful information.

Phoenix: Adopted   Effective  July 6th, 2018 

Cave Creek Adopted  2018 IRC- Adopted January 1st, 2019

Sedona  Spoke With Steve Mertes on July 29th, 2019 – Appended Q is in the works and will be adopted in the next few months- I will be following up with Steve

Building Code Update

Tuscon  Adopted 2018 IRC- Adopted Appendix Q

Camp Verde: On Oct. 24, 2018, the Camp Verde Town Council approved an agri-tourism use permit for a community of tiny houses on wheels, vintage recreational vehicles and agri-tourism events. The 15-acre parcel that would house the complex is owned by Camp Verde residents Carmen Howard and her husband David.

Article SourceTinyPortableCedarCabins 

Coconino County Adopted 4/4/2019 

The Town Of Edgar Adopted 4/2/2019 

Flagstaff   Adopted 2018 IRC and Appendix Q With ConditionsEffective July 19, 2018 

City Of Flagstaff

Pima County

Apache County: Apache County – 2015 Residential Building Code: Appendix Q Not Adopted

Apache County Building Safety Division

Yavapai County: Effective July 1st, 2019 : For Unincorporated Areas Of Yavapai County

Yavapai County

Park Models
A Park Model is allowed as a Dwelling Unit per Section 565 of the Yavapai County Planning and Zoning Ordinance. A permit is required prior to installation of a Park Model Unit

Development Services Yavapai County

California: Mandatory Across All Local Government Jurisdictions: Effective January 1st, 2020

California Building Code Update (6/17/2019) – Appendix Q Tiny Houses: In recent discussions and emails with key staff of CA Department of Housing and Community Development (HCD), we have confirmed the following:
1) HCD has adopted the provisions of Appendix Q which will make its provisions MANDATORY across all local government jurisdictions.
2) We were able to confirm with HCD, that factory-built housing (FBH) next year can be built to CA Residential Code standards, inclusive of Appendix Q, (for units 400 sq. ft. or less).
3) Such FBH units built using Appendix Q standards would be permitted anywhere is California, subject of course to zoning codes.
4) The California building code update will go into effect January 1, 2020.


For the past several months we have been quietly working with California Department of Housing and Community Development (HCD) and the Governor’s Office of Planning and Research (OPR) to ensure that provisions of the 2018 International Residential Code, including our tiny house Appendix Q code provisions, were properly implemented into the California Residential Code. Our concern was that we wanted Appendix Q code items for tiny homes to be, not only adopted by the state, but made MANDATORY in all of the 540 local government jurisdictions.

In past California code update cycles, the various Appendices were left as local option.Why is this important? One can only imagine the effort it would take to convince 540 cities and counties to adopt Appendix Q – a task which would take years to accomplish. Also, if Appendix Q provisions were not adopted across the board for all of California, it would be virtually impossible to factory build tiny house units for wide distribution.


Special Shout Out To Martin Hammer

A special shout out to Martin Hammer for, not only his work with Andrew Morrison in writing Appendix Q, but his efforts to stay on top of state bureaucrats to implement it properly in California.

Source: Dan Fitzpatrick, Director of Government Relations and Advocacy for ATHA

Article Source


Archuleta County: August 28th, 2019 Spoke to planner John Shepherd

Colorado Appendix Q News : Archuleta County Public Meeting Of The Commissioners Adopting 2015 and Appendix Q : Public Welcome Sept 5th,
2019 at 8:30 Am at Archuleta County Administration Office
398 Lewis St, Pagosa Springs, CO 81147
Details Call Mary 907 264 8308 / They welcome written comments before the meeting; Send to

Denver: Public Forum End Of October=Date to be determined- In Progress- Effective Date Fall 2019

Article Source Denver Development Services

Article Source City Of Denver

Garfield County

Garfield County

La Playta County: Effective January 2018

La Playta County

Routt County

Routt County

Town Of Lyons

The Town of Lyons

Florida: Status Appendix Q-Reserved: Spoke to the building dept August 28th, 2019- Modification # F7942

Article Source Florida Dept of business

Georgia: Effective  January 1st, 2020: 2018 IRC and Appendix Q

The  2012 IRC has been amended to change the minimum habitable room size from 120 sf to 70 sf and add a new Appendix for Tiny House Construction. However, the Appendix must be adopted locally to be enforced.

Appendix Q has all ready been adopted: Referred  to as Appendix S until their code cycle change in 2020

Codes Update Spring 2019

Tiny House Fact Sheet 

Map Of Jurisdiction

Idaho: First State To Adopt Appendix Q:  Added to 2012 IRC Code 3/20/17

Article Source Idaho.Gov


Manhattan, Kansas Effective January 1st, 2020 

Article Source City Of Manhattan

Riley County July 28h, 2019- Need to do further investigation 

Riley County requires a permit but does not enforce building codes. The inspector does inspect how a home is being inspected.

Article Source Riley County Gov

Sedgwick County/City of Wichita, Kansas August 21st, 2018
18 Smaller Cities and 2 adjacent Counties

Article Source Wichita.Gov

Louisiana: Adopted December 20th, 2018

Amended current  Rule to add the 2018 International Residential Code ( IRC ) Appendix Q Tiny Homes to the Uniform Construction Code. The Rule  allows for inspection and permitting of said homes in any jurisdiction of the state.

Article Source Louisiana Gov News

Article Source Louisiana Gov News


Article Source Maine Public

Tiny Home City Council Workshop

Maryland Statewide: Adopted Statewide Left Up To Local Jurisdiction

Article Source Maryland Dept. Of Labor

Massachusetts: Effective  January 2020

The newest complete edition of the MA Building Code will be released in 2021.  However, effective 1/1/2020, Appendix Q, also known as the Tiny House Appendix, is anticipated to be adopted into the current Massachusetts state building code.

Article Source BBTinyHome News

House Bill 2031

Mass Gov

Michigan: Appendix Q Is A Selected Option In ”Select IRC Options Use With The Michigan Residential Code”

The Home Builders Association of Michigan (HBAM) and the International Code Council (ICC) have joined forces to publish a targeted book of changes in the 2018 IRC to allow Home Builders Association of Michigan members and others to benefit from their new ability without having to buy the entire code. The book is titled ” 2018 Select IRC Options For Use With The Michigan Residential Code.”

Michigan Is Staying With 2015 IRC Until 2021 Is Adopted

The Flex Code Law, Public Act 504 of 2012 allows Michigan to choose to update the Michigan Residential Code every three or six years. Michigan chose not to update to the 2018 edition of the IRC published by the ICC and will be staying with the 2015 MRC until the 2021 edition of IRC is available and adopted.

Article Source Tiny Home Industry Association


MN has a statewide building code. The state building codes division is preparing to adopt the 2012 editions of the I-Codes.

Article Source ICC

Tiny House Sheet


Camdenton  Adopted 2018 IRC And Apendix Q 

Green City:

Spoke with Joel Binkley on July 31st, 2019. He said they will probably follow Springfield’s lead and Adopt Appendix Q.


Spoke to Ime Usukumah on  July 31st, 2019. He confirmed that they are adopting Appendix Q by the end of the year.

New Hampshire: New Bill To Study Tiny Homes: Effective November 1st, 2019

New Hampshire Established A Bill To Study Tiny Houses: Effective November 1st, 2019: House Bill 312

Those issues include defining the very structures themselves: “The committee shall determine what constitutes a ‘tiny house,’ both on a permanent foundation and on wheels.”
Proponents of tiny homes say they can expand the state’s housing options by providing a relatively low-cost place to live that might help ease labor shortages and keep young adults in the state.

Article Source Legal Scan

New Mexico: Effective January 15th, 2018

Article Source New Mexico Register

New York : Adopting 2018 IRC Including Appendix Q Estimated Effective Date March 2020

2020 Residential Code of New York State

Building Code Standards of New York State

Public Comments Until September 10th, 2019

If you have suggestions on how the proposed rule amending the Uniform Code could be improved, suggested alternatives the proposed rule amending the Uniform Code that the Department of State could consider, or any other comments on the proposed rule amending the Uniform Code, please contact Jeffrey Hinderliter by mail at New York State Department of State Division of Building Standards and Codes, 99 Washington Ave., Albany, NY 12231-0001; by telephone at (518)-474-4073; or by email at

Spoke with Gerald Hathaway on August 6th, 2019

North Dakota : In The Process Of Adopting 2018 IRC: Have NOT Considered Appendix Q At This Time

On September 5th at 8:00 AM CST at The Great River Energy Building, 1611 East Century Ave., Bismarck, ND, a Voting Meeting of proposed building code amendments will be held for the participating jurisdictions and organizations.

The purpose of the meeting will be to vote on the proposed amendments from the public and Building Code Advisory Committee, 2018 International Building Code, 2018 International Residential Code, 2018 International Mechanical Code, 2018 International Fuel Gas Code, 2018 International Existing Building Code, and the prior amendments to those codes. These amendments will become part of the updated North Dakota State Building Code effective January 1st, 2020.

Spoke with Bruce Hagen with the North Dakota Department of Commerce on August 5th, 2019

I asked him if they are considering adopting Appendix Q for Tiny Homes. Bruce told me it had not been brought to the council yet. For information about the State Building Code or to submit a Code Amendment, please contact Bruce Hagen . It is too late in their code cycle process for the council to consider at the Sept 5th, 2019, but you can submit a recommendation using the code submittal form.
at (701) 390-4806.

Code Submittal  Form

Article Source North Dakota Building Codes

Ohio Adopted 2018 IRC: Did NOT Adopt Appendix Q

Personally spoke to the state of  Ohio- on July 25th, 2019 – They have adopted 2018 IRC – But have NOT adopted Appendix Q at this time. I spoke with Jay Richards and he explained that Ohio does not typically adopt an Appendix, they prefer to wait until it is written into the body of the model code. Their focus is on safety, sanitation and energy conservation. The state has no minimum square  footage requirement for a size of a home. It is possible to request a variance and local jurisdictions might have different size requirements for homes. The do not regulate tiny homes on a chassis.

Residential Ohio Rules Effective July 1st, 2019

Article Source ICC Ohio

Yellow Springs

Tiny Home.  A structure built on a permanent chassis with or without wheels which must receive a certificate of occupancy from Greene County Building Regulations in order to be used as a dwelling unit or accessory dwelling unit on a single-family zoned lot.  Greene County Building Regulations will only issue a certificate of occupancy with proof of the following:
      (1)   Built as a manufactured home, proof of certification with a HUD seal is required.
      (2)   Built as an industrialized unit, proof of the industrialized home compliance certificate is required.
      (3)   Built in another state, proof of their former certificate of occupancy is required.
      (4)   Built/constructed in another manner, proof of certification by a registered Ohio design professional.
(Ord. 2013-19. Passed 9-16-13; Ord. 2016-03.  Passed 4-18-16; Ord. 2017-23.  Passed 9-18-17; Ord. 2018-18.  Passed 5-21-18; Ord. 2018-41.  Passed 11-5-18.)

Article Source Yellow Springs Ordinances


Small House Specialty Code Effective October 1st, 2019

Oregon 2018 Reach Code

Small House Speciality Code And Oregon Reach Code 

South Carolina

Greenville, South Carolina:  Tiny Houses 400 Square Foot or Less Residential Permitting Guidelines

The Code of reference for a site built small house is the 2015 International Residential Code (IRC) and as a case by case alternate method the 2018 IRC Appendix Q Tiny Houses as allowed by. (2015 IRC Alternate Method per section  104.11.)

Article Source Greenville County


Knoxville Adopted 2018 IRC And Appendix Q Effective January 1st, 2019 

Article Source Knoxville.Gov


Lake Dallas Tiny Village : Approved As A Planned Development Referencing 2018 IRC Appendix V-  Adapted By Approval Of Lake Dallas For Tiny Homes On Wheels

Article Source Taylor Premier Properties

Amended Ordinance 20190502-LD Ord Amending Tiny Home PD Ordinance-107709

Amended Ordinance Ordinance 2017-14 Amending Zoning Ordinance Gotcher

Note: Appendix Q was previously called Appendix V

San Antonio: Adopted 2018 IRC and Appendix Q Effective June 21st, 2018

Confirmed by

Leslie A. Zavala

Sr. Plans Examiner

San Antonio ICC Code Updates

Development Services Department

Article Source San Antonio Express News

Article Source San Antonio Gov


Springville Effective July 1st, 2019

Utah Gov

Article Source

Salt Lake City: Adopted Appendix Q Effective July 1st, 2019

Building Code Review & Adoption Amendments, was signed into law by Governor Gary Herbert; this will go into effect July 1, 2019. Plans not previously accepted and fees paid for plan review to Salt Lake City Building Services, will be required to be designed & reviewed under the new codes.

Appendix Q of the 2018 edition of the International Residential Code, issued by the International Code Council;

Article Source SLC Gov

Virginia :  In progress including the 2021 edits thanks to the hard work of Thom Stanton and Dan Fitzpatrick!

Washington State

Written Comments Regarding Appendix Q excepted until Sept 27th, 2019. Send to

Meeting notes from July 31st, 2019

Will Appendix Q Be Adopted In Wa?  State Meeting July 31st, 2019: Open To The Public

SUBSTITUTE SENATE BILL 5383 : Effective July 28th, 2019

Section One: Appendix Q Can Provide A Basis For The Standards

The legislature recognizes that the International Code Council in 2018 has issued tiny house building code standards in Appendix Q of the International Residential Code, which can provide a basis for the standards requested within this act.

Section Six

The building code council shall: Adopt Building Code Standards Specific For Tiny Houses

(1)(a) By July 1, 2019, adopt a revised process for the review of proposed statewide amendments to the codes enumerated in RCW919.27.031;

(b) Adopt a process for the review of proposed or enacted local amendments to the codes enumerated in RCW 19.27.031 as amended and adopted by the state building code council.

(2) By December 31, 2019, adopt building code standards specific  for tiny houses.

Article Source LegalWa.Gov

Final Bill Report ESSB 5383

The Council must adopt building code standards specific for tiny houses by December 31, 2019. Appendix Q of the International Residential Code is recognized by the Legislature as a potential basis for the adoption of new building code standards for tiny houses.

Article Source

This analysis was prepared by non-partisan legislative staff for the use of legislative members in their deliberations. This analysis is not a part of the legislation nor does it constitute a statement of legislative intent.


The only state not applicable to IRC building codes. Effective May 1st, 2018 WI adopted  and enforce the 2015 editions of the IBC, IECC, IMC, IFGC, and IEBC.

Article Source ICC

Tiny Home Discussion: Marshfield, Wisconsin August 30th, 2019